How to join my 18-55mm and 70-300mm lenses for Nikon D3100?

I would like to know how can I join these 2 lenses mentioned above?

Added (1). Or else tell me how can I join any 2 lenses!

That isn't going to work.

Sorry, Not going to happen. It's one or the other.

You will need a 52mm to 62mm step-up ring and a 62mm Macro Coupler (its a 62mm to 62mm male fitting). Screw the 52mm to 62mm into the front of your 18-55mm lens and use the 62mm Macro Coupler to attach your two lenses front element to front element.

http://www.bhphotovideo.com/..._Male.html

http://www.bhphotovideo.com/...yes&sts=ma

It just doesn't work like that.

You can't. Just does not work that way. On some zoom lenses you can use a teleconverter which will increase the apparent focal length but you can't screw one lens onto another.

@Edwin: Well I stand corrected. And reading the blurb I see the point, sort of.

Get yourself an Nikkor 18-300mm f3.5-5.6 lens. It is the ultimate travel lens! But it is expensive.

Photographers do not join lenses, in general. What are you trying to do?